THE GLOTTIS. 169 



slit (c, Fig. 43) is named the glottis. The folds forming 

 its sides are elastic and tightly stretched ; they are 

 named the vocal cords. 



FIG. 43. The interior of the larynx as seen when viewed from above and behind, 

 through its opening into the pharynx, i, hyoid bone, which in life has the root of 

 the tongue attached to it ; 5, lower part of the pharynx cut open ; 6, top of the 

 gullet ; 8, 9, 10, the right edge of the opening of the larynx; , ', #", epiglottis; 

 c, glottis (the dotted lines leading from the letter point to the edges of the vocal 

 cords); ', 6', hollows in the mucous membrane of the larynx, above the vocal 

 cords ; fi, b, rounded prominences of the mucous membrane, named the false 

 vocal cords : they play no direct part in the production of voice. 



14. How Voice is Produced. Certain muscles separate 

 the vocal cords and widen the glottis ; others bring the 



14. How do muscles alter the glottis ? What is its state in quiet 



